Technical information

Technical Description
SIMpad SL4
Version V2.0
Siemens AG 18/74
ICM CP 20.08.01, David Brunner
4 Interface
4.1 Serial/headset interface(“Lumberg” plug)
The universal interface ("Lumberg“ plug) is used in Siemens mobile telephones (from
S25 and higher) and provides the following part interfaces for the SIMpad SL4:
• serial interface (RS-232; V.24 level conversion 12 V)
• audio headset interface
Via the serial interface, the SIMpad SL4 can communicate with a PC for data
exchange (see 5.4.5), or with peripherals (external keyboard, modem, mobile
telephone). For this, a crossed (9-pin) serial cable is used (see 6.1.3). Data
transmission is possible in one direction at a time only (no duplex).
The serial cable for Siemens mobile phones has an integrated level conversion.
Therefore it cannot be used for the SIMpad SL4 which requires a simple cable without
level conversion (see 6.1.3).
Standard
Plug type "Lumberg“ plug; Siemens proprietary
Pin assignment
Pin 1 GND
Pin 2 TXD, Output
Pin 3 RXD, Input
Pin 4 DTR, Output
Pin 5 RTS, Output
Pin 6 DSR, Input
Pin 7 CTS, Input
Pin 8 DCD, Input
Pin 9 Microphone -, Input
Pin 10 Microphone +, Input
Pin 11 Ear +, Output
Pin 12 Ear -, Output
112
Fig. 3 Universal interface: "Lumberg“ plug with pin numbering
4.2 USB-Client interface
The USB-Client interface is not supported due to a defect of the StrongARM SA-1110
processor (see 2.2).